Water Cooled VRF System

Each unit contains inverter compressors, a plate heat exchanger, and controls in a compact indoor cabinet.

A VRF condenser water pump or water source VRF circulation pump moves water through the loop. VFDs allow variable flow operation.

Heat is rejected through an open cooling tower, a closed-circuit cooling tower, or a dry cooler, depending on climate and water quality needs.

Insulated or uninsulated condenser water piping, isolation valves, and strainers distribute water to every unit and protect heat exchangers from debris.

Flow switches and interlocks stop VRF units if water flow is lost, protecting compressors and heat exchangers.

Chemical dosing, filtration, and blowdown control prevent scaling, corrosion, and biological growth in the loop.

Cassette, ducted, hi wall, and floor indoor units, along with room and central controllers, complete the system.

A water cooled VRF heat pump, also called a water source VRF heat pump, provides cooling or heating, with all zones in one mode at a time.

Water cooled heat recovery VRF, or water source heat recovery VRF, provides simultaneous heating and cooling in different zones, with heat recovery at both the refrigerant and water loop levels.

An open cooling tower with an intermediate plate heat exchanger keeps the VRF loop clean and separated from tower water. This is a popular VRF cooling tower system arrangement.

A closed-circuit cooler keeps loop water sealed from the atmosphere, reducing fouling and water treatment needs.

A geothermal VRF system uses the ground as a heat source and sink through buried water loops. It is highly efficient but depends on site conditions and investment.

Each VRF unit has a manufacturer-specified water flow range. Correct VRF condenser water flow ensures proper heat transfer and prevents trips.

VRF entering water temperature and leaving water temperature must stay within the allowed range for cooling and heating operation.

Cooling towers are selected for total heat rejection, local design wet-bulb temperature, and approach.

Pumps are sized for flow and head, with VFDs enabling variable water flow VRF operation to save pumping energy. Inverter pump water cooled VRF designs further reduce energy use.

Strainers and side-stream filters keep debris out of plate heat exchangers, which have narrow passages.

Cooling tower fan control, bypass valves, and in heating-dominant climates a boiler, keep the loop within the required temperature range. A water source VRF with boiler and cooling tower suits colder regions.

Detailed load calculation for every room forms the basis of water cooled VRF system design.

Unit capacity is selected in HP based on peak loads, diversity, and the allowed connection ratio.

Units can be grouped in central plant rooms or placed floor-wise to keep refrigerant piping short, which is ideal for tall buildings.

Refrigerant piping stays within manufacturer limits, which is easier with floor-wise unit placement.

Room volumes are checked against refrigerant charge to ensure safety in case of leaks.

In heat recovery models, heat moves between cooling and heating zones within the same refrigerant circuit.

When some units are cooling and others heating, heat rejected into the water loop by one unit can be absorbed by another, reducing cooling tower and boiler load.

Some systems can use the loop or recovered heat to generate hot water for domestic use.

Because heat rejection depends on water rather than hot outdoor air, an energy efficient water cooled VRF delivers consistent efficiency even in peak summer.

Water cooled inverter VRF compressors match output to demand for high part-load efficiency.

VRF variable water flow control with VFD pumps and cooling tower fan speed control further reduces energy use. This makes a high efficiency water source VRF system possible.

Most water cooled VRF systems use R410A, with R32 options emerging for lower global warming potential.

Room controllers provide local comfort, while central controllers manage the whole system.

VRF units are interlocked with pumps and cooling towers so they operate only when water flow is confirmed.

Sensors track loop temperatures and flow, alerting operators before problems affect performance.

A water cooled VRF with BMS integration connects VRF units, pumps, and cooling towers to the building management system.

Energy use is apportioned to each tenant for fair billing in multi-tenant buildings.

Capacity stays stable even in extreme Indian summers.

Condensing units sit indoors, freeing terraces and keeping facades clean.

A water cooled VRF for high-rise buildings avoids long refrigerant risers by placing units on each floor or zone.

Water-based heat rejection and stable operating conditions improve overall efficiency.

Heat can be shared between units through the loop, saving energy in mixed-load buildings.

With no outdoor condensing units, the building exterior stays quiet. Only the cooling tower is outside.

Units are compact enough for small plant rooms or service areas on each floor.

A cooling tower, pumps, and piping add complexity.

Cooling towers consume water and need continuous treatment.

Additional equipment increases project cost.

Heat exchangers, cooling towers, and water treatment need regular maintenance.

Indoor space is needed for VRF units and pumps.

Water piping inside the building requires drip trays and leak protection.

Compress India designs and maintains every water cooled VRF system to manage these limitations effectively.

Floor-wise water cooled units avoid long refrigerant risers and crowded terraces.

Indoor installation solves space problems on dense urban sites.

A water cooled VRF for hotels delivers quiet, room-wise comfort, with heat recovery options for hot water.

Stable capacity and heat recovery benefit hospitals with continuous and varied loads.

Retail, office, and residential zones share the water loop, with heat moving between them.

Existing cooling tower infrastructure can be reused, reducing retrofit costs.

Indoor units preserve heritage facades.

With condensing units indoors, corrosion from salt-laden air is greatly reduced. It is also an excellent water cooled VRF for commercial buildings along the coast.

Daikin water cooled VRF, known as VRV-W, is widely used in high-rise and commercial projects.

Mitsubishi water cooled VRF under the City Multi range offers heat pump and heat recovery options.

Hitachi offers water cooled VRF systems for commercial buildings.

LG water cooled VRF, sold as Multi V Water, provides options for towers and space-constrained projects.

Samsung water cooled VRF under the DVM S Water range offers compact indoor condensing units.

Other manufacturers, including Gree, also offer water cooled VRF systems. Compress India recommends the best-fit brand for your project.

Plate heat exchangers are cleaned or descaled when performance drops or pressure differences rise.

Cooling tower fills, nozzles, fans, and basins are cleaned and inspected regularly.

Water quality is tested and chemical dosing adjusted to prevent scaling and corrosion.

Strainers are cleaned, and pumps are checked for vibration, seals, and performance.

Refrigerant joints and connections are inspected for leaks.

Error codes are analysed to identify and fix faults quickly.

• Comprehensive AMC: Covers scheduled maintenance plus specified spare parts, with predictable annual costs.
• Non-Comprehensive AMC: Covers scheduled maintenance and service visits, with spare parts charged separately.

Causes: clogged strainers, pump issues, or closed valves.

Solution: Clean strainers, check pumps and valves, and rebalance flow.

Causes: poor cooling tower performance or high heat load.

Solution: Clean and service the cooling tower and verify fan and flow operation.

Causes: poor water treatment or debris in the loop.

Solution: Descale or clean heat exchangers and improve water treatment and filtration.

Causes: clogged fills, faulty fans, or poor water distribution.

Solution: Clean fills and nozzles and repair fans.

Causes: bearing wear, seal leaks, or electrical faults.

Solution: Repair or replace pumps, and consider standby pumps for critical systems.

Causes: loose joints, failed gaskets, or corrosion.

Solution: Repair joints and fit drip trays and leak detection.

Causes: poor brazing, vibration, or sensor faults.

Solution: Repair leaks, recharge, and replace faulty components.

Older water cooled packaged units can be replaced with water cooled VRF for zone control and better efficiency.

Existing cooling towers and condenser water piping can often be reused after inspection.

Systems can be upgraded to heat recovery models for simultaneous heating and cooling.

Upgraded controllers, interlocks, and BMS integration improve monitoring and efficiency.

Water cooled VRF units are priced per HP and typically cost more per HP than air cooled units.

Cooling towers, pumps, piping, valves, strainers, and water treatment add to the total project cost.

Refrigerant and condenser water piping, plant room work, electrical, controls, and BMS integration form a significant part of the cost.

Building height, number of units, cooling tower type, heat recovery, existing infrastructure, and site conditions all affect the final price.

Share your building drawings with Compress India to receive an accurate water cooled VRF quotation.